Finnix is described as 'small, self-contained, bootable Linux CD distribution for system administrators, based on Debian GNU/Linux' and is an app in the OS & Utilities category. There are more than 10 alternatives to Finnix for Linux, Windows, Self-Hosted solutions and Mandriva Linux. The best alternative is Hiren’s BootCD. It's not free, so if you're looking for a free alternative, you could try Hiren’s BootCD PE or SystemRescue. Other great apps like Finnix are SliTaz (Free, Open Source), Parted Magic (Paid), Knoppix (Free, Open Source) and Grml (Free, Open Source).
Hiren’s BootCD PE (Preinstallation Environment) is a restored edition of Hiren’s BootCD based on Windows 10 PE x64. PE version is being developed by Hiren’s BootCD fans. it supports UEFI booting and requires minimum 2 GB RAM.
SystemRescue is a Linux system rescue toolkit available as a bootable medium for administrating or repairing your system and data after a crash. It aims to provide an easy way to carry out admin tasks on your computer, such as creating and editing the hard disk partitions.
SliTaz is a free operating system, working completely in RAM and booting from removable media such as a CD-ROM or USB key. SliTaz is distributed as a LiveCD, and weighs less than 40MB. The system is quick and responsive, clean and robust.
The Parted Magic OS employs core programs of GParted and Parted to handle partitioning tasks with ease, while featuring other useful programs (e.g. Partition Image, TestDisk, fdisk, sfdisk, dd, and ddrescue) and an excellent set of documentation to benefit the user.
Knoppix is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive.
Rescatux is a GNU/Linux rescue cd (and eventually also Windows) but it is not like other rescue disks. Rescatux comes with Rescapp. Rescapp is a nice wizard that will guide you through your rescue tasks.
Trinity Rescue Kit or TRK is a free live Linux distribution that aims specifically at recovery and repair operations on Windows machines, but is equally usable for Linux recovery issues. Since version 3.